Apparatus for evaporating sirups



(No Model.)

v A D. D. POWERS;

} APPARATUS FOR EVAPORATING SIRUP S, &0. ANDPOR A GLARIFYING THESA'ME.. No, 293,782.- Patented P'eb.x 1-9;-1884.

I WITNESSES Attorney m VENTOR N4 PETERS, Phalwlilhngmpber, wnhin tcn. ILC.

UNITED ST TES- PATENT ()FFICE.

DANIEL DAVIDSON POWERS, OF OZ'ARK, KANSAS.

APPARATUS FOR EVAFORATING SIRUPS, 810., AND FOR CLARIFYING THE SAME.

- SPECIFICATION forming part of Letters Patent No. 293,782, dated February 19, 1884.

Application filed March 31, 1883. (No model.) I

To all whom it may concern:

Be it known that I, DANIEL Davrnson Pownns, a citizen of the United States, resid ingat Ozark, in the county of Anderson and State of Kansas, have invented certain new and useful Improvementslvi-n Apparatus for Evaporating Sirups and other Liquids, and for the Clarification and Refining of Sirups and Sugars; and I do hereby declare the following tobe a full, clear, and exact description of the invention such as will enable others skilled in the art to which. it-appertains to make and use the same, reference being had to the accompanying drawings, making part of this specification.

Figure 1 is'a front viewof my improved evaporator, showing the blower in section and the evaporating-box in perspective, with the front side removed. Fig. 2'is a section of one of the evaporating-compartments in the line X X, Fig. 1. Fig. 3 is a view of thestrainer,

- as hereinafter described.

My improvements relate to that class of evaporators in which heated air is used as the and refining. The air is supplied to the evap orating-vessels through a pipe into which air is forced by a blower, A, which is operated by any convenient or suitable means. The pressure of the air in the pipe is regulated by the SELfB'E-Y-VELIVG'G. The air, which is forced along the pipe B by the blower, is heated by passing through a heating-vessel, O, in which the pipe B is coiled. The interior of the ves- Sol 0 is kept at a high temperature by steam or other suitable means. The air as it emerges hot from the coils in the furnace 0 passes along the main pipe B and through the pipes D D into the several compartments E E of the evaporating-tank. Each pipe D has fitted to its lower end a horizontal pipe, G, extending along a lower angle of the compartments E. The air passes from the pipe G into the com partments E through perforations a a, so that the fluid in the evaporator is furnished with air through the whole width of the evaporator. The pipe G is situated in the extreme lower angle of the compartments E, so that the air is forced through the liquid in the direction of the front of the compartment, and the liquid is kept in constant motion toward the front part, and the scum arising thereon is thrown so as to readily passinto the trough, hereinafter described.

The sirup or other liquid to be. evaporated is supplied from a suitable tank, H, and passes therefrom into the compartments E by means of a pipe, I.

The evaporator consists of several com artments E E, and the hot air may be supplied to all or any of them, or may be shut off altor gether by means of the valves b b and e e on the main pipe B and the branch pipes l) D, respectively. 1

In the evaporation of sirups and other liquids the temperature of the evaporating agent must be properly regulated, as a too high temperature scorches the sirups or liquids, if vegetable in substance, and such scorching gives the product a dark color and disagreeable flavor;

and also the temperaturemust be properly lowered as the sirup thickens, since the greater the consistency of the sirup the more liable it is to be scorched; also, alternations of hot and cold air maybe employed for refining V Bbetween the blowerAand the heating-chest C an opening of suitable dimensions is made on the main pipe Band a pipe, K, fittedtherein. This pipe K passes outside of the heating-chest G, and re-enters the main pipe B at some point between the chest 0 and the evapcrating-boxes E E. Between the point where the pipe Kre-enters the pipe B and the evaporating-boxes E E is situated a safety-valve, d, which regulates the supply of hot air, and a thermometer, f, whose bulb extends into the interior of the pipe B, and by means of which the temperature of the air may be ascertained. The pipe K is supplied with acut-ofi' valve, 9, which regulates the amount of cold air passing through said pipe. The cold-air pipeK may, if desired, extend the whole length of the evaporating compartments, and have communicating pipes, furnished with cut-01f valves, leading from it to each descending pipe I), a thermometer being attached to each pipe D. By this means may be known and controlled the temperature of the air furnished to each separate compartment.

The operation of the evaporator, as far as the air-supply is concerned,is as follows: The cut-off valve 9 being closed, the cold air is forced by the blower A through the pipe 13, the pressure being regulated by the safetyvalve through the coils in the heating-box 0,

whence it emerges at a high temperature. The supply of air is now further regulated by the safety-valve d, and the temperature of the air ascertained by the thermometer f. The heated air passes through the pipe B, the branches D D and G G, through the perforations a a, into the compartments E E. The air entering the compartments E E at the lower rear angle passes obliquely upward and forward, carrying with it the liquid and throwing the scum toward the trough M. In case of the air be; coming too hot, or through the thickening of the sirups a lower temperature is necessary, or for alternating the hot with cold air for purposes of clarifying and refining, the cut-oil? valve 9 is opened, and cold air is forced along the pipe K and mingles with the hot air,which at .the same time emerges from the heating-box. and thus reduces the temperature of the air supplied to the evaporators. The amount of cold air admitted is regulated by the extent of the opening of the valve g. Thus at all times the temperature of the air supplied can be easily and quickly regulated with no cessation of the evaporating process.

The construction of the compartments E E is another feature of myinvention. The rear side, 7:, of each of the evaporating-comparttition, 0, between whose two parts, 0 0, slides a gate, L. parts 0 0.

This gate fits water-tight in the The partition 0 does not reach as high as the edge of the compartment E. \Vhen scum arises 011 the liquid whiclrisbeing evaporated, the gate is lowered and the scum allowed to run into the trough M, formed by the partition 0 and the side m. As some of the clear sirup necessarily passes over with the scum and settles at the bottom of the trough M, in order that none may be wasted a pipe, N, is provided, connecting the bottom of the trough with the compartments E E. The pipe N is provided with a strainer, 1), so that none of the scum can return to the compartments E E. Gates P are also provided for connecting the compartments E E when such connection is desirable.

W'hat Iclai in as new, and desire to secure by Letters Patent, is-

1. The method herein described of evaporating and clarifying saccharine juices, sirups, and other material, which consists in passing streams or jets of heated and atmospheric air alternately through the material, as and for the purpose set forth.

2. An evaporating apparatus in which the material to be treated is subjected to streams or jets of heated and cold air, the main airpipe B, leading into a heated chamber or any suitable devicei'or heating, and the branch pipe K, leading from the main pipe 13 in front of heating-chamber, and with branch pipes joining hot-air pipes in front of sections of evaporators, in combination with a blower or other air-forcing apparatus, whereby the material to be treated can be subjected to jets of hot or cold air, as occasion may require, as and for the purpose set forth.

3. An evaporating apparatus in which the material to be treated is heated or boiled by E. B. ELLIs, R. P. Soorr. 

